I have an older Rapala knife that will run off 110, 12 volt battery clips or cigarette light plug. It is in a gray case instead of the newer ones in a black case. Love it and used it for years. The newer ones don't have the same rpm's as my older one. I now use the top of the line American Angler 110 volt knife and it's the best knife I have ever used. I think a inverter would be your best bet if cleaning many fish that way you still have the higher rpm's of a 110 knife and you don't have to worry about the battery being charged when your ready to use it.